<VV> Piston clearance

[corvairs]

Clark - .002 clearance is fine for pretty much any brand of cast piston 
in most applications - forged is another issue where .0035 (our absolute 
minimum) all the way to .005 can be suggested.

As to the specific issue of our barrells and Clarks pistons I am not up 
to speed yet so will not comment other than - In order to match a 
particular brand of pistons it may be necessary for us to have them 
present to get correct clearance and 2, if you try and do a feeler 
clearance where the barrel is NOT under compression (as it is when we 
bore and hone) you may get bad readings.  I will wait and see what 
transpires as I will match our barrels up to anyone elses anytime 
anywhere.......Lon

www.corvairunderground.com

Clark Hartzel wrote:

>Many previous posts are talking about .002 clearance on Corvair pistons.
>Maybe I'm too "race" oriented but that sounds too tight to me.  Since
>Corvairs run twice as hot as waterpumpers and aluminum expands alot more
>than iron barrels,  I think .005-.007 clearance would be more appropriate.
>Any comments from the engine gurus here?
>Clark Hartzel
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